Magenta ink composition, ink set, ink cartridge, and utilizing these, method of recording, recording system and recording product

Abstract

The object of the present invention is to provide a magenta ink which is excellent in color reproducibility in a region of high saturation and low luminosity, which is less prone to clogging in an inkjet type recording head, and whose gloss is also improved, and an inkjet ink comprising the ink Recording ink set. The present invention provides a magenta ink composition having a b* value of -29 or less when the a* value of the CIE standard calculated from the visible light absorption spectrum is 80 in a diluted aqueous solution of 10,000 times or less, and a magenta ink composition having a pigment concentration of 2 The above-mentioned magenta ink composition and an ink set containing the ink composition preferably have a CIE standard a* value of 7 or more calculated from the visible light absorption spectrum in a dilute aqueous solution of ×10-3 g/l. In addition, the present invention provides a magenta ink composition having a b* value of not less than -38 and not more than -29 when the a* value of the CIE standard calculated from the visible light absorption spectrum is 80 in a diluted aqueous solution of 10000 times or less, and the above-mentioned magenta ink composition and an ink set containing the above-mentioned magenta ink composition preferably having a CIE standard a* value calculated from the visible light absorption spectrum of 5 or more in a diluted aqueous solution having a pigment concentration of 2×10-3 g/l.

Description

technical field [0001] This invention relates to novel magenta ink compositions. In particular, it relates to a magenta ink composition which is excellent in color reproducibility in a high-saturation and low-brightness red region, has improved gloss, and is less prone to clogging in inkjet nozzles, and a recorded image having at least a specific magenta ink Ink set with excellent gloss, and magenta ink with excellent color reproducibility in the red area with high saturation and low lightness, excellent graininess, improved gloss, and less clogging in inkjet nozzles Compositions and ink sets comprising the magenta ink compositions. Background technique [0002] Conventionally, inks using pigments such as C.I. Pigment Red 202 and C.I. Pigment Red 122 as coloring materials have been proposed as magenta inks for color inkjet recording (see, for example, Patent Document 1). [0003] When C.I. Pigment Red 202 and C.I. Pigment Red 122 are used, if the pigment concentration in t...

AI Technical Summary

Problems solved by technology

[0005] However, glycerin functions as a wetting agent for preventing clogging in inkjet discharge devices, so when its content is reduced, it tends to become an ink that is prone to clogging

[0006] In addition, although the existing magenta ink has excellent color reproduction in the dark part of L*40 or less of the recorded product, the graininess is insufficient.

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